As with any other rust value it depends how you create it. If you just to "let x = ..." in your function then it'll be on the stack. If you do "let x = Box<...>

As with any other rust value it depends how you create it. If you just to "let x = ..." in your function then it'll be on the stack. If you do "let x = Box<...>" then it'll be on the heap.